Magneto-optical studies of flux pinning in high-temperature superconductors
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Ch. Joss
and
J. Albrecht
Abstract
Quantitative magneto-optical imaging of magnetic flux distributions has developed in a powerful tool for the analysis of the local transport properties of superconductors. It allows a model-independent determination of the current density distribution of thin films and, thus, the local current density through individual defects. Also, local metastable properties are detectable, such as the local electric field distribution E with a high sensitivity down to 10–12 V/m caused by thermally activated flux creep. Based on these tools, in this paper we present a systematic comparison of vortex pinning, vortex movement and current transfer of two kinds of planar defects which are typically present in high-temperature superconducting thin films: low-angle grain boundaries and antiphase boundaries. Special attention is drawn to the local magnetic field dependence of the critical current density and to the spatial distribution of E, giving insight into the collective behavior of vortices at planar defects.
Dedicated to Professor Dr. Helmut Kronmüller on the occasion of his 70th birthday
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We are grateful to H.U. Habermeier and to K. Guth for preparing the samples and to H. Kronmüller and H.C. Freyhardt for their support. This work is supported by the Deutsche Forschungsgemeinschaft DFG (project 216042).
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© 2002 Carl Hanser Verlag, München
Articles in the same Issue
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- Notifications/Mitteilungen
- Personal/Personelles
- Bücher/Books
- Conferences/Konferenzen
- DGM Training/DGM Fortbildung
Articles in the same Issue
- Frontmatter
- Editorial
- Editorial
- Articles/Aufsätze
- Interplay between chemical and magnetic roughness of Pt in a Pt/Co bilayer investigated with X-ray resonant magnetic reflectometry
- Thermal stability and magnetic anisotropy dispersion in high-density hard-disk media
- Thickness dependence of magnetization structures in thin Permalloy rectangles
- Solving the selectivity problem in magnetic random access memories using configurations that form C-states
- Second-order magnetoelastic effects: From the Dirac equation to the magnetic properties of ultrathin epitaxial films for magnetic thin-film applications
- Magnetic relaxation in nanocrystalline systems: linking Monte Carlo steps with time
- Effect of domain size on the magneto-elastic damping in amorphous ferromagnetic metals
- The character and role of grain boundaries in NdFeB-type alloys and magnets
- Magnetic domain structure and spin reorientation process
- Magnetic properties of Tb(Fe, Mo)12 and Tb(Fe, Mo)12C compounds
- Microstructure, magnetic properties and magnetic hardening in 2 : 17 Sm–Co magnets
- Micromagnetism and microstructure – tailoring of high-performance permanent magnets
- Metastable alloys at moderate cooling rates
- Thermal critical phenomena and crossover between critical regimes in ferromagnets with long-range interactions
- Vacancies in thermal equilibrium and ferromagnetism near the Curie temperature
- The vortex lattice in superconductors
- Functional substrates – a novel approach to tailor transport properties and flux-line pinning in YBa2Cu3O7 – x thin films
- Superconducting permanent magnets and their application in magnetic levitation
- Magneto-optical studies of flux pinning in high-temperature superconductors
- Atomic transport in amorphous metals
- A novel technique for measuring diffusivities of short-lived radioisotopes in solids
- Hydrogen four-level tunnel systems in substitutional body-centred cubic alloys
- Magnetic relaxation phenomena in cobalt
- The Verwey transition in magnetite as studied by means of definite impurity doping
- Notifications/Mitteilungen
- Personal/Personelles
- Bücher/Books
- Conferences/Konferenzen
- DGM Training/DGM Fortbildung
